Favorite changes.

- Add 'likes' to activity, collection of ids of people who liked it.
- show if you favorited something or not.
- Don't allow double favorites
- Address favorites to the followers of the liked activity's author.

TODO.txt

@@ -1,8 +1 @@
 - Add cache for user fetching / representing. (mostly in TwitterAPI.activity_to_status)
-
-Favorites:
-- Add 'likes' to activity, collection of ids of people who liked it.
-- show if you favorited something or not.
-- Don't allow double favorites
-- Address favorites to the followers of the liked activity's author.
-

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -19,16 +19,31 @@ def insert(map) when is_map(map) do
     Repo.insert(%Activity{data: map})
   end
 
-  def like(%User{ap_id: ap_id}, object = %Object{data: %{ "id" => id}}) do
+  def like(%User{ap_id: ap_id} = user, %Object{data: %{ "id" => id}} = object) do
+    cond do
+      # There's already a like here, so return the original activity.
+      ap_id in (object.data["likes"] || []) ->
+        query = from activity in Activity,
+          where: fragment("? @> ?", activity.data, ^%{actor: ap_id, object: id})
+
+        activity = Repo.one(query)
+        {:ok, activity, object}
+      true ->
         data = %{
           "type" => "Like",
           "actor" => ap_id,
-      "object" => id
+          "object" => id,
+          "to" => [User.ap_followers(user)]
         }
 
         {:ok, activity} = insert(data)
-    like_count = (object.data["like_count"] || 0) + 1
-    new_data = object.data |> Map.put("like_count", like_count)
+
+        likes = [ap_id | (object.data["likes"] || [])] |> Enum.uniq
+
+        new_data = object.data
+        |> Map.put("like_count", length(likes))
+        |> Map.put("likes", likes)
+
         changeset = Ecto.Changeset.change(object, data: new_data)
         {:ok, object} = Repo.update(changeset)
 
@@ -39,9 +54,9 @@ def like(%User{ap_id: ap_id}, object = %Object{data: %{ "id" => id}}) do
           changeset = Ecto.Changeset.change(activity, data: new_activity_data)
           Repo.update(changeset)
         end)
-
         {:ok, activity, object}
     end
+  end
 
   def generate_activity_id do
     generate_id("activities")

lib/pleroma/web/twitter_api/representers/activity_representer.ex

@@ -45,6 +45,7 @@ def to_map(%Activity{} = activity, %{user: user} = opts) do
     created_at = get_in(activity.data, ["object", "published"])
     |> date_to_asctime
     like_count = get_in(activity.data, ["object", "like_count"]) || 0
+    favorited = opts[:for] && opts[:for].ap_id in (activity.data["object"]["likes"] || [])
 
     mentions = opts[:mentioned] || []
 
@@ -66,7 +67,8 @@ def to_map(%Activity{} = activity, %{user: user} = opts) do
       "statusnet_conversation_id" => activity.data["object"]["statusnetConversationId"],
       "attachments" => (activity.data["object"]["attachment"] || []) |> ObjectRepresenter.enum_to_list(opts),
       "attentions" => attentions,
-      "fave_num" => like_count
+      "fave_num" => like_count,
+      "favorited" => !!favorited
     }
   end
 

test/web/activity_pub/activity_pub_test.exs

@@ -1,7 +1,7 @@
 defmodule Pleroma.Web.ActivityPub.ActivityPubTest do
   use Pleroma.DataCase
   alias Pleroma.Web.ActivityPub.ActivityPub
-  alias Pleroma.{Activity, Object}
+  alias Pleroma.{Activity, Object, User}
   alias Pleroma.Builders.ActivityBuilder
 
   import Pleroma.Factory
@@ -124,7 +124,15 @@ test "adds a like activity to the db" do
       assert like_activity.data["actor"] == user.ap_id
       assert like_activity.data["type"] == "Like"
       assert like_activity.data["object"] == object.data["id"]
+      assert like_activity.data["to"] == [User.ap_followers(user)]
       assert object.data["like_count"] == 1
+      assert object.data["likes"] == [user.ap_id]
+
+      # Just return the original activity if the user already liked it.
+      {:ok, same_like_activity, object} = ActivityPub.like(user, object)
+
+      assert like_activity == same_like_activity
+      assert object.data["likes"] == [user.ap_id]
 
       [note_activity] = Activity.all_by_object_ap_id(object.data["id"])
       assert note_activity.data["object"]["like_count"] == 1

test/web/twitter_api/representers/activity_representer_test.exs

@@ -11,11 +11,16 @@ test "a like activity" do
     note_activity = insert(:note_activity)
     object = Object.get_by_ap_id(note_activity.data["object"]["id"])
 
-    {:ok, like_activity, object} = ActivityPub.like(user, object)
+    {:ok, like_activity, _object} = ActivityPub.like(user, object)
     status = ActivityRepresenter.to_map(like_activity, %{user: user, liked_activity: note_activity})
 
     assert status["id"] == like_activity.id
     assert status["in_reply_to_status_id"] == note_activity.id
+
+    note_activity = Activity.get_by_ap_id(note_activity.data["id"])
+    activity_actor = Repo.get_by(User, ap_id: note_activity.data["actor"])
+    liked_status = ActivityRepresenter.to_map(note_activity, %{user: activity_actor, for: user})
+    assert liked_status["favorited"] == true
   end
 
   test "an activity" do
@@ -84,7 +89,8 @@ test "an activity" do
       "attentions" => [
         UserRepresenter.to_map(mentioned_user, %{for: follower})
       ],
-      "fave_num" => 5
+      "fave_num" => 5,
+      "favorited" => false
     }
 
     assert ActivityRepresenter.to_map(activity, %{user: user, for: follower, mentioned: [mentioned_user]}) == expected_status